FloatingPointError: divide by zero encountered in true_divide

[Ben19Foster]

Hi Zoran,

I am trying to create a viewshed using the graphical modeler, the first part of creating the viewpoints works fine, however when I create the viewshed I get the following error. Also, when I do the exact same process outside of graphical modeler it works fine.

Traceback (most recent call last):

File"C:/Users/Ben/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\ViewshedAnalysis\algorithms\viewshed_raster.py", line 245, in processAlgorithm interpolate = precision > 0)
File"C:/Users/Ben/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\ViewshedAnalysis\algorithms\modules\visibility.py", line 178, in viewshed_raster data /= distance_matrix #all one line = (data -z - mxcurv) /mx_dist
FloatingPointError: divide by zero encountered in true_divide

Error encountered while running Viewshed

[zoran-cuckovic]

Hello,
you have quite a complex routine, many things could go wrong... There seems to be a zero viewshed radius somewhere (division by zero error). I can't tell where this could come from. (Perhaps if you attach your model I might be able to test the thing).

[Ben19Foster]

Hello, The create viewpoints seems to work fine, it’s the viewshed part that’s the problem; I have even tried creating the viewpoints first outside of the modeler, leaving just the viewshed algorithm in the modeler, but it still comes up with the same error. I can't seem to attach the model, I tried emailing it as a zip file but don't think it worked, how do I do this?

[Ben19Foster]

Hello,

I've copy and pasted the script into a PDF, let me know if it doesn't work and I will try something else.

Viewshed Script.pdf

[zoran-cuckovic]

Hello,
I can't tell what is wrong here... If you're trying to create a cumulative viewshed from a point-grid, I've attached here a model which should work : test_cumulative_viewshed.zip
As an image :

Hope this would help!